WO2021051752A1 - Module de rétroéclairage appliqué à un panneau d'affichage - Google Patents

Module de rétroéclairage appliqué à un panneau d'affichage Download PDF

Info

Publication number
WO2021051752A1
WO2021051752A1 PCT/CN2020/078150 CN2020078150W WO2021051752A1 WO 2021051752 A1 WO2021051752 A1 WO 2021051752A1 CN 2020078150 W CN2020078150 W CN 2020078150W WO 2021051752 A1 WO2021051752 A1 WO 2021051752A1
Authority
WO
WIPO (PCT)
Prior art keywords
light
backlight module
arc
infrared light
guide plate
Prior art date
Application number
PCT/CN2020/078150
Other languages
English (en)
Chinese (zh)
Inventor
傅同龙
王伟榕
周正三
Original Assignee
神盾股份有限公司
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by 神盾股份有限公司 filed Critical 神盾股份有限公司
Publication of WO2021051752A1 publication Critical patent/WO2021051752A1/fr

Links

Images

Classifications

    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06V—IMAGE OR VIDEO RECOGNITION OR UNDERSTANDING
    • G06V40/00—Recognition of biometric, human-related or animal-related patterns in image or video data
    • G06V40/10—Human or animal bodies, e.g. vehicle occupants or pedestrians; Body parts, e.g. hands
    • G06V40/12—Fingerprints or palmprints
    • G06V40/13—Sensors therefor
    • G06V40/1318—Sensors therefor using electro-optical elements or layers, e.g. electroluminescent sensing
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F3/00—Input arrangements for transferring data to be processed into a form capable of being handled by the computer; Output arrangements for transferring data from processing unit to output unit, e.g. interface arrangements
    • G06F3/01—Input arrangements or combined input and output arrangements for interaction between user and computer
    • G06F3/03—Arrangements for converting the position or the displacement of a member into a coded form
    • G06F3/041—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means
    • G06F3/042—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means by opto-electronic means

Definitions

  • the present invention relates to an electronic device with an under-screen infrared biosensor, and in particular to an electronic device that can be applied to liquid crystal displays (Liquid Crystal Display, LCD) and OLEDs with under-screen infrared biosensors
  • liquid crystal displays Liquid Crystal Display, LCD
  • OLEDs with under-screen infrared biosensors
  • Today's mobile electronic devices (such as mobile phones, tablet computers, laptops, etc.) are usually equipped with user biometric systems, including different technologies such as fingerprints, face shapes, irises, etc., to protect personal data security, such as mobile phones Or smart watches and other portable devices, which also have the function of mobile payment.
  • biometric identification has become a standard function.
  • the development of portable devices such as mobile phones is even more towards full screen (or ultra-narrow).
  • CMOS Complementary Metal-Oxide Semiconductor
  • CIS complementary Metal-Oxide Semiconductor
  • sensing components and optical lens modules The miniaturized optical imaging device is placed at the bottom of the screen (can be called under the screen), through the screen part of the light (especially organic light emitting diode (Organic Light Emitting Diode, OLED) screen), can capture the object pressed on the top of the screen
  • OLED Organic Light Emitting Diode
  • optical biosensors such as fingerprint sensors
  • the optical module contains a CMOS image sensor (CIS) chip or module, and a lens array module (Lens array module), these components or modules are mainly placed under the OLED display. Because the OLED display itself transmits light, there is no problem in implementation.
  • CIS CMOS image sensor
  • Liens array module lens array module
  • an LCD has components such as a backlight module, a brightness enhancement film, and a light guide plate. RGB visible light enters from the side, and then diffuses out from the light guide plate and the brightness enhancement film to homogenize or obscure the light.
  • ARC anti-reflection coating
  • Another problem to be solved in this case is that, for example, the resolution of OLED displays is getting higher and higher, and the visible light FOD is limited by the lower and lower visible light transmittance of the display (the resolution is getting higher and higher), which makes the sensor’s visible light signal
  • SNR Signal-to-Noise Ratio
  • uLED Micro Light Emitting Diode
  • an object of the embodiments of the present invention is to provide an electronic device with an under-screen infrared biosensor and a backlight module applied to a display panel.
  • the electronic device has functions of information display and biosensing.
  • an embodiment of the present invention provides an electronic device, which at least includes a backlight module, a display panel, a light-transmitting protection plate, an optical sensor, and an infrared light source.
  • the backlight module provides visible light traveling upward, and has a reflective layer to block visible light traveling downward.
  • the display panel is arranged above the backlight module and displays information according to visible light.
  • the light-transmitting protection board is arranged above the display panel and allows information to pass through.
  • the optical sensor is arranged under the backlight module.
  • the infrared light source provides infrared light to life objects located on or above the light-transmitting protective plate.
  • the biological body reflects infrared light and generates reflected infrared light. The reflected infrared light is received by the optical sensor through the light-transmitting protective plate, the display panel and the backlight module, so that the optical sensor obtains an image representing the biological body An image signal to realize the under-screen image sensing function.
  • the present invention also provides an electronic device, which at least includes: a display panel that provides visible light traveling upward and displays information according to the visible light; a light-transmitting protective plate arranged above the display panel to allow information to pass through; and an optical
  • the sensor is arranged under the display panel; and an infrared light source, which provides infrared light to the living objects on or above the light-transmitting protective plate.
  • the biological body reflects the infrared light to generate reflected infrared light, and the reflected infrared light passes through the transparent protective plate.
  • the light protection plate and the display panel are received by the optical sensor, so that the optical sensor obtains an image signal representing an image of the biological body.
  • the present invention further provides a backlight module applied to a display panel, which at least includes a light guide plate and a visible light source.
  • the light guide plate cooperates with an infrared light source to generate an infrared light.
  • the visible light source is arranged on one side of the light guide plate and emits light into the light guide plate to travel to generate a visible light. In this way, the required light for information display and biological sensing can be provided.
  • the use of infrared light can allow the optical sensing module disposed under the LCD to obtain a good biometric image without affecting the display function of the LCD, and the reflective layer of the LCD has different characteristics for infrared light and visible light.
  • the reflective layer that makes visible light impenetrable can allow infrared light to penetrate, and the reflected infrared light from the finger can easily penetrate the reflective layer to reach the optical sensor disposed under the reflective layer, achieving biometric sensing Function to provide an optical biosensing solution for electronic devices equipped with LCD displays.
  • it is also suitable for optical biosensing applications such as OLED displays and other displays.
  • FIG. 1 shows a schematic diagram of an electronic device with an under-screen infrared biosensor according to a preferred embodiment of the present invention.
  • FIG. 1A shows a schematic diagram of a modification of the electronic device of FIG. 1.
  • Fig. 2 shows a partial schematic diagram of the electronic device of Fig. 1.
  • FIG. 2A shows a schematic diagram of a modification of the electronic device of FIG. 2.
  • FIG. 3 shows a schematic diagram of an example of the combined structure of the backlight module, the display panel, and the light-transmitting protective plate of FIG. 1.
  • Fig. 4 shows a partial schematic diagram of an actual configuration example of Fig. 1.
  • Fig. 5 and Fig. 6 show partial schematic diagrams of two modified configuration examples of Fig. 4.
  • Figures 7 to 9 show schematic diagrams of three configurations of the infrared light source relative to the light-transmitting protective plate.
  • Fig. 10 to Fig. 12 show schematic diagrams of three variation examples of Fig. 1.
  • FIG. 13 shows a three-dimensional schematic diagram of the backlight module corresponding to FIG. 10.
  • FIG. 14 shows a front view of the backlight module corresponding to FIG. 13.
  • 15 and 16 show front views of two modification examples of the backlight module corresponding to FIG. 14.
  • FIG. 17 shows a three-dimensional schematic diagram of a variation of the backlight module corresponding to FIG. 10.
  • FIG. 18 shows a partial schematic diagram of the backlight module corresponding to FIG. 10.
  • FIG. 19 shows a partial schematic diagram of the light guide plate corresponding to FIG. 18.
  • FIG. 20 shows a partial schematic diagram of another example of the light guide plate corresponding to FIG. 19.
  • Figure 21 shows a schematic diagram of the dimensions of the various components of the light guide plate.
  • Figures 22A to 22F show fingerprint images obtained by using six different sizes of light guide plates.
  • FIG. 23 shows a schematic diagram of an electronic device with an under-screen infrared biosensor according to another embodiment of the invention.
  • Fig. 24 shows a modified example of the electronic device of Fig. 23.
  • FIG. 25 shows a front view of a modification example of the optical sensor and infrared light source of FIG. 23.
  • FIG. 26 shows a top view of the optical sensor of FIG. 25.
  • IR1 infrared light
  • IR2 reflected infrared light
  • VL Visible light
  • infrared can penetrate the above-mentioned ARC.
  • the IR is put on the finger, and the finger reflects the IR downward through the cover glass, the display panel and the backlight module and is received by the CIS module.
  • the CIS module receives the CIS module.
  • the outgoing IR is blurred, and the reflected IR is also blurred, making the image of the sensed fingerprint blurred. If you want to transmit IR from the front to your finger, there will be many interference problems that need to be solved.
  • This case proposes four design architectures to achieve IR emission to the finger.
  • the first is related to lateral lighting. IR is emitted from one side of the protective glass (cover glass), where an ARC can be set under the protective glass to keep the IR intensity of the incident protective glass at a high intensity.
  • TIR Total Internal Reflection
  • the second is about changing the design of the backlight module, putting some IR LEDs in the visible light (red, green and blue GB) LED array on the side of the backlight module.
  • the third is about the use of a linear array of RGB LEDs and another linear array of IR LEDs arranged in parallel.
  • the fourth is to modify the design of the light guide module. In this way, IR lighting can be set in all possible positions, including side lighting and down lighting.
  • FIG. 1 shows a schematic diagram of an electronic device 100 with an under-screen infrared biosensor according to a preferred embodiment of the present invention.
  • FIG. 2 shows a partial schematic diagram of the electronic device 100 of FIG. 1.
  • the electronic device 100 is, for example, a mobile phone, a tablet computer, a wearable device, an electronic device with a biometric sensing function, and the like.
  • the electronic device 100 at least includes a backlight module 10, a display panel 20, a light-transmitting protection plate 30, an optical sensor 40 and an infrared light source 50.
  • the electronic device 100 has a function of displaying information to interact with the user, and may also have a touch function to allow the user to input instructions or data.
  • the central processing unit (not shown) of the electronic device 100 can be unlocked. In order to allow users to perform advanced operations, or conduct transactions, etc.
  • the backlight module 10 provides visible light VL to travel upward, and the backlight module 10 has a reflective layer 11 to block the visible light VL from traveling downward (a direction away from the display panel 20).
  • the display panel 20 is disposed above the backlight module 10 for displaying information according to visible light VL.
  • the application on mobile devices such as mobile phones may be a display cell or a display unit with touch function.
  • the light-transmitting protective plate 30 is arranged above the display panel 20 to allow information to pass through.
  • the application on mobile devices such as mobile phones may be Cover Glass (CG).
  • the optical sensor 40 is disposed under the backlight module 10.
  • the optical sensor 40 is a lens-type optical sensor, which utilizes one lens or a combination of multiple lenses to achieve the image sensing function, and the optical sensor 40 in another example is an ultra-thin optical sensor. It has a micro lens collimator design.
  • the infrared light source 50 provides infrared light IR1 to a living object F located on or above the light-transmitting protective plate 30.
  • the infrared light source 50 is disposed above the reflective layer 11.
  • the biological body F of a finger reflects infrared light IR1 to generate reflected infrared light IR2, and the reflected infrared light IR2 is received by the optical sensor 40 through the light-transmitting protection plate 30, the display panel 20, and the backlight module 10, so that The optical sensor 40 obtains an image signal representing an image of the biological body F.
  • Images include fingerprint images, blood vessel images, blood oxygen concentration images, and other biological organ information on the skin surface or under the skin.
  • the above configuration structure can achieve the effect of the present invention, and achieve the function of under-screen infrared biosensing. It is worth noting that the above-mentioned “reflection” may be the reflection of infrared light by the surface of the biological body F, or the phenomenon that infrared light enters the biological body F and is emitted from the biological body F.
  • the infrared light source 50 is arranged under the light-transmitting protective plate 30 and arranged on one side of the display panel 20. That is, the area of the light-transmitting protection plate 30 is larger than the area of the display panel 20, and the infrared light source 50 is disposed in the redundant space formed by the light-transmitting protection plate 30 and the display panel 20.
  • the optical sensor 40 is arranged under the backlight module 10 and beside the battery 90 of the electronic device 100. In another embodiment, the optical sensor 40 (for example, with an ultra-thin microlens collimator design) may be disposed between the battery 90 and the backlight module 10, as shown in FIG. 1A.
  • the infrared light IR1 passes through an anti-reflection layer 31 of the light-transmitting protection plate 30, and the anti-reflection layer 31 prevents the infrared light IR1 from being reflected by the light-transmitting protection plate 30 and cannot reach the biological body F.
  • the infrared light source 50 is located under the backlight module 10, and provides a downward lighting method, which is also applicable to the above-mentioned embodiment.
  • FIG. 3 shows a schematic diagram of an example of the combined structure of the backlight module 10, the display panel 20 and the light-transmitting protective plate 30 of FIG. 1.
  • the backlight module 10 and the display panel 20 constitute a liquid crystal display (LCD).
  • the backlight module 10 at least includes a reflective layer 11, a light guide plate (LGP) 12, a visible light source 13, and a diffusing brightness enhancement layer 15.
  • the diffusion brightness enhancement layer 15 includes a diffusion layer (Diffuser, DIFF) 16 and a brightness enhancement film (Brightness Enhanced Film, BEF) 17.
  • the reflective layer 11 is, for example, an enhanced specular reflector (ESR) produced by 3M Company.
  • ESR enhanced specular reflector
  • the display panel 20 includes a rear polarizer 21, a rear alignment layer 22, a liquid crystal layer 23, a front electrode 24, a color filter layer 25, and a front polarizer 26 stacked sequentially from bottom to top.
  • OCA optical clear adhesive
  • the configuration of the embodiment of the present invention is suitable for the application of LCD, but is not particularly limited thereto. Any display provided with a reflective layer that reflects visible light belongs to the application of the embodiment of the present invention.
  • Fig. 4 shows a partial schematic diagram of an actual configuration example of Fig. 1.
  • a driver 18 of the electronic device 100 controls the operation of the backlight module 10 and the display panel 20, so that the electronic device 100 can display information to the user.
  • the infrared light IR1 penetrates the light-transmitting protective plate 30 and irradiates a peak FR of the biological body F directly in contact with the light-transmitting protective plate 30 to generate reflected infrared light IR2, and the reflected infrared light IR2 is coupled Into the light-transmitting protective plate 30, a part of the image corresponding to the peak FR is in a bright state.
  • a valley FV of the living body F cannot reflect the infrared light IR1 penetrating through the light-transmitting protective plate 30, so that a part of the image corresponding to the valley FV appears dark.
  • a distance between the infrared light source 50 and the biological body F is between 10 mm and 30 mm or between 15 mm and 20 mm, or the distance between the sensing area of the biological body F and the infrared light source 50 is between 10 mm and 30 mm. Between 30mm or between 15mm and 20mm. In the example shown in FIG. 4, a fairly uniform light field can be obtained, which enhances the image sensing result.
  • Fig. 5 and Fig. 6 show partial schematic diagrams of two modified configuration examples of Fig. 4.
  • the infrared light IR1 penetrates the light-transmitting protective plate 30 and irradiates a free end FT of the biological body F.
  • the free end FT is coupled into the biological body F to generate reflected infrared light IR2, or infrared
  • the light IR1 is scattered in the biological body F to generate reflected infrared light IR2.
  • the peak FR of the biological body F directly contacting the light-transmitting protection plate 30 couples the reflected infrared light IR2 into the light-transmitting protection plate 30, so that a part of the image corresponding to the peak FR appears bright, and the valley The part FV cannot couple the reflected infrared light IR2 into the biological body F.
  • the illuminating light received by the organism F is relatively consistent. Compared with the method of FIG. 6 described later, the change is relatively small, and there is relatively no problem that the residue on the light-transmitting protective plate 30 affects the image sensing.
  • the distance between the infrared light source 50 and the biological body F is between 15 mm and 20 mm, or the distance between the sensing area of the biological body F and the infrared light source 50 is between 15 mm and 20 mm.
  • the infrared light IR1 is totally reflected in the light-transmitting protective plate 30, and the peak FR of the biological body F that directly contacts the light-transmitting protective plate 30 couples the infrared light IR1 into the biological body F to make the peak FR A part of the corresponding image presents a dark state, and the valley FV cannot couple the infrared light IR1 into the biological body F, so that the corresponding part sensed by the optical sensor 40 presents a bright state.
  • the advantage of using total reflection is that the distance between the infrared light source 50 and the biological body F can be relatively long, and the light field will be relatively uniform, because the attenuation degree of infrared light is not high if the total reflection efficiency is to reach a certain level.
  • Figures 7 to 9 show schematic diagrams of three configurations of the infrared light source relative to the light-transmitting protective plate. These three configurations can each be applied to the structures of FIGS. 4 to 6.
  • the light field can be changed by rotating the configuration angle of the light-emitting unit of the infrared light source 50, so that the circuit board 55 on which the light-emitting unit is installed presents a tilted non-horizontal state, which can provide a better light field for living beings.
  • the frame of the current mobile device is about 1 mm to allow the rotation of the infrared light source 50, but the frame can also be enlarged to provide a suitable space for rotation. As shown in FIG.
  • the infrared light source 50 includes: a light-emitting unit 51 that emits infrared light IR1; and a lens 52 with a specific curvature covering the light-emitting unit 51 to change the light divergence angle and light field of the infrared light IR1.
  • the light-emitting unit 51 includes a light-emitting diode (LED) or a laser diode (LD), and the laser diode includes a vertical-cavity surface-emitting laser (Vertical-Cavity Surface-Emitting Laser).
  • the wavelength of the light emitted by the LD is 940 nanometers (nm).
  • the packaging of LEDs or LDs can be changed, and special zone rate lenses or structures can be used to change the light divergence angle and light field. With current technology, 0402 LED packaging can be used.
  • the infrared light source 50 includes: a light-emitting unit 51 that emits infrared light IR1; and an optical film 53 disposed on the light-emitting unit 51, and the optical film 53 is attached to the light-transmitting protective plate 30 and covers the light-emitting unit 51.
  • the light-emitting unit 51 includes a light-emitting diode or a laser diode
  • the optical film 53 includes a grating, a Fresnel lens or element, or a diffractive element.
  • the diffractive element is, for example, a diffractive optical element (DOE).
  • DOE diffractive optical element
  • the optical film it is better to use nearly parallel light output, so it can be matched with LED or LD, and use collimator or collimating structure on the package to make a simple collimation effect, and then use these elements to make the light angle and light Field changes and control can make design easier.
  • the optical film may integrate the functions of at least two of collimation, grating, Fresnel lens, and diffractive element to generate the required light field.
  • the optical film can be attached to the side or bottom surface of the light-transmitting protective plate 30, and then the LED or LD can be attached to the optical film to change the light divergence angle and light field.
  • the mechanism is easy to assemble and also There is no need to expand the frame, just add a little thickness, and the increased thickness does not affect the entire LCD, so the cost can be reduced, for example, the optical film can be manufactured by nano-imprinting.
  • the LED and the optical film are in a bonded state, the design needs to consider near-field optics. With the above settings, the light field can be changed to meet the function of biometric sensing.
  • FIG. 10 to Fig. 12 show schematic diagrams of three variation examples of Fig. 1.
  • FIG. 13 shows a three-dimensional schematic diagram of the backlight module corresponding to FIG. 10.
  • FIG. 14 shows a front view of the backlight module corresponding to FIG. 13.
  • the infrared light source 50 and the visible light source 13 of the backlight module 10 are arranged on the same side of the backlight module 10.
  • the multiple light emitting units 51 of the infrared light source 50 and the multiple visible light emitting diodes 14 of the visible light source 13 of the backlight module 10 are arranged on the same side of the light guide plate 12 of the backlight module 10.
  • the light emitting units 51 and the visible light emitting diodes 14 are alternately arranged on the same side of the light guide plate 12 and arranged in a straight line. It is worth noting that although FIG. 14 uses two infrared light emitting diodes as an example for illustration, in another example, four infrared light emitting diodes are interspersed between the visible light emitting diodes 14 to obtain The light field of image sensing.
  • FIGS. 11 and 16 show front views of two modification examples of the backlight module corresponding to FIG. 14.
  • the light-emitting units 51 and the visible light-emitting diodes 14 are arranged on the same side of the light guide plate 12 and arranged in two straight lines.
  • these light emitting units 51 and these visible light emitting diodes 14 are arranged on the same side of the light guide plate 12 and arranged in two straight lines, and the distribution area of these light emitting units 51 is smaller than that of these visible light emitting diodes. 14 distribution area.
  • the multiple light emitting units 51 of the infrared light source 50 and the multiple visible light emitting diodes 14 of the visible light source 13 of the backlight module 10 are arranged on the opposite side of the light guide plate 12 of the backlight module 10.
  • FIG. 17 shows a three-dimensional schematic diagram of a variation of the backlight module corresponding to FIG. 10. As shown in FIG. 17, the multiple light emitting units 51 of the infrared light source 50 and the multiple visible light emitting diodes 14 of the visible light source 13 of the backlight module 10 are arranged on the adjacent side of the light guide plate 12 of the backlight module 10.
  • FIG. 18 shows a partial schematic diagram of the backlight module corresponding to FIG. 10.
  • FIG. 19 shows a partial schematic diagram of the light guide plate corresponding to FIG. 18.
  • the backlight module 10 is applied to the display panel 20 or used in conjunction with the display panel 20, thereby providing light required for information display and biological sensing.
  • the light guide plate 12 of the backlight module 10 cooperates with the infrared light source 50 to generate infrared light IR1 (the light source 50 is not a necessary component here, because it can also be arranged on the side as shown in Figure 4 to Figure 6, that is, the infrared light is reflected from the fingerprint and penetrates.
  • the visible light source 13 is arranged on one side of the light guide plate 12, and emits light into the light guide plate 12 to travel to generate visible light VL.
  • the light guide plate 12 at least includes a base 12A, a plurality of arc-shaped protrusions (Dot) 12B, and a plurality of V-cuts (V-cut) 12C.
  • the arc-shaped convex portion 12B is disposed on a bottom surface 12D of the substrate 12A, and is used to destroy the total reflection of light in the substrate 12A to generate visible light VL.
  • the V-shaped cut portion 12C is disposed on a top surface 12E of the substrate 12A, and is used to destroy the total reflection of light in the substrate 12A to generate visible light VL. That is, without the arc-shaped protrusion 12B and the V-shaped cut portion 12C, the light from the visible light source 13 can only be totally reflected in the substrate 12A, and the arc-shaped protrusion 12B and/or the V-shaped cut portion 12C can be used to The light is guided out to generate visible light VL.
  • the arc-shaped convex portion 12B and the V-shaped cut portion 12C will also affect the travel of infrared light. Therefore, without affecting the visible light VL, it is necessary to design a better arc-shaped convex portion 12B and the V-shaped cut portion 12C to obtain acceptable Fingerprint image.
  • FIG. 20 shows a partial schematic diagram of another example of the light guide plate corresponding to FIG. 19. As shown in FIG. 20, it is not necessary to provide the V-shaped cut portion 12C.
  • Figure 21 shows a schematic diagram of the dimensions of the various components of the light guide plate.
  • the arc-shaped convex portion 12B has a radius R and a height H.
  • the pitch of the distribution of these arc-shaped convex portions 12B is equal to the pitch P.
  • Figures 22A to 22F show fingerprint images obtained by using six different sizes of light guide plates. In this disclosure, six different design parameters (as listed in Table 1) are used to obtain six fingerprint images ( Figure 22A to Figure 22F), and the modulation transfer function (Modulation Transfer Function) value MTF (representing blurred image) Degree) is also listed in Table 1.
  • Modulation Transfer Function Modulation Transfer Function
  • the effect of the light guide plate 12 on the display function of all examples is not much different, so by comparing the MTF values of the fingerprint images, you can obtain which parameters are better.
  • Table 1 and Figures 22A to 22F it can be seen that the MTF value is correlated with P/H. From the first and second examples, the radius R is the same, but the larger the P/H value, the higher the MTF value. . Judging from the second case, the fourth case and the sixth case, the P/H is similar, but the larger the R value, the higher the MTF value. Although the P/H value of the sixth case is slightly lower than the second and fourth cases, However, the contribution of the R value can make the MTF value of the sixth case higher.
  • P is preferably not more than 100 microns, and more preferably not. More than 80 microns.
  • the integrated design specifications for fingerprint applications are as follows.
  • the pitch P of the distribution of these arc-shaped protrusions 12B is less than or equal to 150, 100, or 80 microns to avoid moiré fringes.
  • the radius of each arc-shaped protrusion 12B is between 10 and 300 microns (between 10 and 150 microns, or between 30 and 120 microns, more preferably between 20 and 110 microns), and
  • the ratio of the distance P to the height H of each arc-shaped convex portion 12B is between 30 and 300 (between 20 and 150, between 30 and 120, or more preferably between 35 and 45).
  • the design example is that P/H is equal to 40. When P/H increases, improved fingerprint image quality can be obtained. Therefore, the above design specifications can suppress moiré and increase the MTF value without affecting the display function.
  • the content of the disclosure is not only applicable to side lighting and light guide plate lighting, but also applicable to down lighting.
  • the use of infrared light can allow the optical sensing module disposed under the LCD to obtain a good biometric image without affecting the display function of the LCD, and the reflective layer of the LCD has different characteristics for infrared light and visible light.
  • the reflective layer that makes visible light impenetrable can allow infrared light to penetrate, and the reflected infrared light from the finger can easily penetrate the reflective layer to reach the optical sensor disposed under the reflective layer, achieving biometric sensing Function to provide an optical biosensing solution for electronic devices equipped with LCD displays.
  • FIG. 23 shows a schematic diagram of an electronic device with an under-screen infrared biosensor according to another embodiment of the invention.
  • this embodiment provides an electronic device 100 that at least includes a display panel 20, a light-transmitting protective plate 30, an optical sensor 40 and an infrared light source 50.
  • the display panel 20 provides visible light VL traveling upward, and displays information according to the visible light VL.
  • the display panel 20 includes, but is not limited to, an Organic Light Emitting Diode (OLED) display panel.
  • OLED Organic Light Emitting Diode
  • the light-transmitting protection plate 30 is arranged above the display panel 20 to allow information to pass through.
  • the optical sensor 40 is disposed under the display panel 20.
  • the infrared light source 50 provides infrared light IR1 to a living object F located on or above the light-transmitting protective plate 30.
  • the infrared light IR1 is, for example, Near Infrared (NIR) light, and the wavelength is about 0.75 to 1.4 microns.
  • the biological body F reflects infrared light IR1 and generates reflected infrared light IR2.
  • the reflected infrared light IR2 is received by the optical sensor 40 through the transparent protective plate 30 and the display panel 20, so that the optical sensor 40 obtains an image signal representing an image of the biological body F.
  • the infrared light source 50 is located on one side of the display panel 20. With the above configuration, the function of under-screen infrared biosensing can also be achieved.
  • Fig. 24 shows a modified example of the electronic device of Fig. 23.
  • the difference from FIG. 23 is that the infrared light source 50 is located under the display panel 20.
  • the infrared light source 50 has one or more light-emitting units 51, such as light-emitting diodes.
  • the light-emitting units 51 can be arranged beside or around the optical sensor 40, and provide infrared light IR1 to penetrate the display panel 20 and the light-transmitting protective plate 30 to reach
  • the biological body F can also achieve the function of under-screen infrared biological sensing.
  • FIG. 25 shows a front view of a modification example of the optical sensor and infrared light source of FIG. 23.
  • FIG. FIG. 26 shows a top view of the optical sensor of FIG. 25.
  • the infrared light source 50 includes one or more light-emitting units 51 and a light guide plate 56.
  • the light-emitting unit 51 provides initial infrared light IR0.
  • the light guide plate 56 is located around the optical sensor 40 and guides the initial infrared light IR0 to generate infrared light IR1.
  • the optical sensor 40 includes a sensing unit 42 and a lens module 41.
  • the optical sensor can also be an ultra-thin optical sensor with a microlens collimator design.
  • the reflected infrared light IR2 passes through the lens module 41 and is focused on the sensing unit 42 to obtain a sensed image.
  • the lens module 41 may be a single lens, or may be a stack of multiple lenses, or may be composed of multiple lenses arranged in a two-dimensional array.
  • the light guide plate 56 may have a ring structure (for example, a circular ring or a polygonal ring structure), and is disposed around the lens module 41. In this way, the light guide plate 56 can be used to process the light of the light emitting unit 51 into a uniform and upward direction. Infrared light IR1, can provide uniform infrared light to improve sensing quality.
  • the light emitting unit 51 may be arranged on the side or the lower side of the light guide plate 56.
  • the embodiments of the present invention can provide an optical biosensing solution for an electronic device equipped with an LCD or OLED display, including an electronic device with an under-screen infrared biosensor and a backlight module applied to a display panel.

Landscapes

  • Engineering & Computer Science (AREA)
  • Theoretical Computer Science (AREA)
  • Human Computer Interaction (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • General Engineering & Computer Science (AREA)
  • Multimedia (AREA)
  • Image Input (AREA)
  • Planar Illumination Modules (AREA)
  • Liquid Crystal (AREA)
  • Measurement Of The Respiration, Hearing Ability, Form, And Blood Characteristics Of Living Organisms (AREA)

Abstract

Un module de rétroéclairage (10) est appliqué à un panneau d'affichage (20). Le module de rétroéclairage comprend au moins une plaque de guidage de lumière (12) et une source de lumière visible (13), la plaque de guidage de lumière (12) générant une lumière infrarouge (IR1) en coopération avec une source de lumière infrarouge (50) ; et la source de lumière visible (13) étant disposée sur un côté de la plaque de guidage de lumière (12), et émettant un rayon de lumière dans la plaque de guidage de lumière (12) pour générer une lumière visible (VL), fournissant ainsi un rayon de lumière qui est requis pour l'affichage d'informations et la biodétection.
PCT/CN2020/078150 2019-09-16 2020-03-06 Module de rétroéclairage appliqué à un panneau d'affichage WO2021051752A1 (fr)

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
US201962900812P 2019-09-16 2019-09-16
US62/900,812 2019-09-16
US201962940445P 2019-11-26 2019-11-26
US62/940,445 2019-11-26

Publications (1)

Publication Number Publication Date
WO2021051752A1 true WO2021051752A1 (fr) 2021-03-25

Family

ID=70786154

Family Applications (2)

Application Number Title Priority Date Filing Date
PCT/CN2020/078151 WO2021051753A1 (fr) 2019-09-16 2020-03-06 Dispositif électronique pourvu d'un biocapteur infrarouge sous-écran
PCT/CN2020/078150 WO2021051752A1 (fr) 2019-09-16 2020-03-06 Module de rétroéclairage appliqué à un panneau d'affichage

Family Applications Before (1)

Application Number Title Priority Date Filing Date
PCT/CN2020/078151 WO2021051753A1 (fr) 2019-09-16 2020-03-06 Dispositif électronique pourvu d'un biocapteur infrarouge sous-écran

Country Status (3)

Country Link
CN (4) CN213240740U (fr)
TW (4) TWM595259U (fr)
WO (2) WO2021051753A1 (fr)

Families Citing this family (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN112417933A (zh) * 2019-08-23 2021-02-26 华为技术有限公司 背光模组及电子设备
WO2021051753A1 (fr) * 2019-09-16 2021-03-25 神盾股份有限公司 Dispositif électronique pourvu d'un biocapteur infrarouge sous-écran
CN117631388A (zh) * 2020-06-19 2024-03-01 群创光电股份有限公司 显示设备
US11594170B2 (en) * 2020-07-13 2023-02-28 Visera Technologies Company Limited Micro light-emitting diode display panel, micro light-emitting diode display device, and fingerprint identification method
US12008835B2 (en) 2020-10-01 2024-06-11 Fingerprint Cards Anacatum Ip Ab Biometric imaging arrangement for infrared imaging comprising a waveguide formed on an image sensor
CN112099259A (zh) * 2020-10-15 2020-12-18 武汉华星光电技术有限公司 一种液晶显示模组、液晶显示装置
CN113377242B (zh) * 2021-06-22 2023-12-15 武汉华星光电技术有限公司 显示模组
CN113536962A (zh) * 2021-06-24 2021-10-22 武汉天马微电子有限公司 显示装置及指纹识别方法

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103941323A (zh) * 2013-01-18 2014-07-23 鸿富锦精密工业（深圳）有限公司 导光板
US20160350576A1 (en) * 2013-08-06 2016-12-01 Apple Inc. Electronic device including blurred finger image deblurring circuitry and related methods
CN106569360A (zh) * 2015-10-10 2017-04-19 博昱科技（丹阳）有限公司 导光片、背光源装置及液晶显示装置
CN109313703A (zh) * 2018-08-15 2019-02-05 深圳市汇顶科技股份有限公司 屏下光学指纹识别系统、背光模组、显示屏幕及电子设备
CN109902655A (zh) * 2019-03-11 2019-06-18 深圳阜时科技有限公司 生物特征检测模组和背光模组及电子装置
CN109919103A (zh) * 2019-03-11 2019-06-21 深圳阜时科技有限公司 生物特征检测模组和背光模组及电子装置

Family Cites Families (26)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR100961702B1 (ko) * 2008-05-16 2010-06-09 엘지전자 주식회사 광학 시트, 이를 포함하는 백라이트 유닛 및 액정표시장치
CN101840089B (zh) * 2009-03-17 2013-08-21 鸿富锦精密工业（深圳）有限公司 触控式显示装置
TWI410703B (zh) * 2009-06-18 2013-10-01 Au Optronics Corp 光學感測元件、其製作方法及光學式觸控裝置
TWI386591B (zh) * 2010-01-15 2013-02-21 Young Lighting Technology Corp 光源裝置
CN102983154B (zh) * 2012-11-05 2015-10-21 深圳典邦科技有限公司 一种集成透明oled微显示的图像收发装置及其制作方法
JP6181936B2 (ja) * 2013-02-25 2017-08-16 恵和株式会社 ライトガイドフィルムの製造方法、ライトガイドフィルム、超薄型液晶バックライトユニット及び携帯型コンピュータ
TWI544254B (zh) * 2014-02-10 2016-08-01 元太科技工業股份有限公司 光源模組及顯示裝置
CN104898895B (zh) * 2015-05-04 2017-11-03 上海交通大学 基于光栅结构与补偿光源的光波导式光学触摸屏
CN107004130B (zh) * 2015-06-18 2020-08-28 深圳市汇顶科技股份有限公司 用于屏幕上指纹感应的屏幕下光学传感器模块
CN104991296A (zh) * 2015-07-16 2015-10-21 宁波东旭成新材料科技有限公司 一种波浪型自修复增亮膜
TWI595279B (zh) * 2015-10-13 2017-08-11 元太科技工業股份有限公司 反射式顯示裝置與其前光模組
CN205317976U (zh) * 2015-12-23 2016-06-15 重庆鑫翎创福光电科技股份有限公司 一种导光板
US10055062B2 (en) * 2016-03-29 2018-08-21 Microsoft Technology Licensing, Llc Pressure sensing display
US10417473B2 (en) * 2016-09-07 2019-09-17 Mei-Yen Lee Optical imaging system with variable light field for biometrics application
CN108427908B (zh) * 2017-02-13 2020-08-07 神盾股份有限公司 指纹辨识系统及感测方法及制造方法
CN207937734U (zh) * 2018-02-05 2018-10-02 瑞仪光电(南京)有限公司 量子点背光模组及显示装置
US10303921B1 (en) * 2018-02-26 2019-05-28 Shenzhen GOODIX Technology Co., Ltd. On-LCD screen optical fingerprint sensing based on optical imaging with lens-pinhole module and other optical designs
CN208400147U (zh) * 2018-05-03 2019-01-18 东莞市美光达光学科技有限公司 一种用于屏幕下方的红外线式指纹识别模组
CN110175494A (zh) * 2018-07-06 2019-08-27 神盾股份有限公司 光学指纹感测装置
CN208654486U (zh) * 2018-07-31 2019-03-26 Oppo广东移动通信有限公司 显示屏及电子设备
WO2020056544A1 (fr) * 2018-09-17 2020-03-26 深圳市汇顶科技股份有限公司 Système de détection optique sous-écran, dispositif électronique et procédé de détection de proximité d'objet associé
CN208672966U (zh) * 2018-09-20 2019-03-29 Oppo广东移动通信有限公司 电子装置
TWM579772U (zh) * 2018-12-25 2019-06-21 金佶科技股份有限公司 指紋辨識模組
CN109799635A (zh) * 2019-01-16 2019-05-24 柳州阜民科技有限公司 一种电子设备
CN109902649A (zh) * 2019-03-11 2019-06-18 深圳阜时科技有限公司 生物特征检测模组和背光模组、显示器及电子装置
WO2021051753A1 (fr) * 2019-09-16 2021-03-25 神盾股份有限公司 Dispositif électronique pourvu d'un biocapteur infrarouge sous-écran

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103941323A (zh) * 2013-01-18 2014-07-23 鸿富锦精密工业（深圳）有限公司 导光板
US20160350576A1 (en) * 2013-08-06 2016-12-01 Apple Inc. Electronic device including blurred finger image deblurring circuitry and related methods
CN106569360A (zh) * 2015-10-10 2017-04-19 博昱科技（丹阳）有限公司 导光片、背光源装置及液晶显示装置
CN109313703A (zh) * 2018-08-15 2019-02-05 深圳市汇顶科技股份有限公司 屏下光学指纹识别系统、背光模组、显示屏幕及电子设备
CN109902655A (zh) * 2019-03-11 2019-06-18 深圳阜时科技有限公司 生物特征检测模组和背光模组及电子装置
CN109919103A (zh) * 2019-03-11 2019-06-21 深圳阜时科技有限公司 生物特征检测模组和背光模组及电子装置

Also Published As

Publication number Publication date
TWM595259U (zh) 2020-05-11
CN213240740U (zh) 2021-05-18
CN211207353U (zh) 2020-08-07
TW202113570A (zh) 2021-04-01
CN111208665A (zh) 2020-05-29
TWI725761B (zh) 2021-04-21
TWM595251U (zh) 2020-05-11
TW202113433A (zh) 2021-04-01
WO2021051753A1 (fr) 2021-03-25
TWI730658B (zh) 2021-06-11
CN111222497A (zh) 2020-06-02

Similar Documents

Publication Publication Date Title
WO2021051752A1 (fr) Module de rétroéclairage appliqué à un panneau d'affichage
CN107561754B (zh) 嵌入有光学图像传感器的平板显示器
CN107422788B (zh) 嵌入有光学成像传感器的平板显示器
CN108182873B (zh) 嵌入有光学图像传感器的平板显示器
CN111033518B (zh) Lcd指纹识别系统、屏下光学指纹识别装置和电子装置
CN108877492B (zh) 嵌入光学成像传感器的平板显示器
CN108227064B (zh) 定向光学单元和显示器
US10628656B2 (en) Image capture apparatus
CN112199979A (zh) 能够侦测一手指的指纹的显示装置与指纹识别芯片
US10489631B2 (en) Biometric identification module
CN111095289B (zh) 屏下指纹识别装置以及终端设备
US11721125B2 (en) Device for displaying information and for capturing autopodial impressions
CN112867954A (zh) 用于光学直接记录用于移动应用的皮肤印纹的设备
CN108803781B (zh) 具有光学成像传感器的平板显示器
WO2020181443A1 (fr) Module de détection biométrique, module de rétroéclairage et dispositif électronique
CN211698980U (zh) 一种传感模组及电子设备
CN210402376U (zh) 生物特征检测模组和背光模组及电子装置
CN210402370U (zh) 生物特征检测模组和背光模组及电子装置
CN210573817U (zh) 生物特征检测模组和背光模组及电子装置
WO2021128025A1 (fr) Appareil de reconnaissance d'empreintes digitales, module de rétroéclairage, écran d'affichage et dispositif électronique
CN211124079U (zh) 一种传感模组及电子设备
CN210402367U (zh) 生物特征检测模组和背光模组及电子装置
CN211319234U (zh) 屏下指纹识别装置以及终端设备
CN210573818U (zh) 生物特征检测模组和背光模组及电子装置
CN210402366U (zh) 电子装置

Legal Events

Date Code Title Description
121 Ep: the epo has been informed by wipo that ep was designated in this application

Ref document number: 20865399

Country of ref document: EP

Kind code of ref document: A1

NENP Non-entry into the national phase

Ref country code: DE

122 Ep: pct application non-entry in european phase

Ref document number: 20865399

Country of ref document: EP

Kind code of ref document: A1